Product Introduction

• Structure: Precision-forged from high-strength 20CrMnTi alloy steel, with an external involute gear tooth profile and internal splines for press-fit onto the input shaft. The gear undergoes carburizing, quenching, and precision grinding, achieving a surface hardness of HRC 58–62and a core hardness of HRC 33–45 for optimal wear resistance and impact toughness.

• Performance: The hardened, ground tooth surface resists pitting and wear under high torque loads, while the tough core withstands shock loads during gear engagement. The precision-machined internal splines ensure a zero-backlash press-fit connection to the input shaft.

Core Function

1. 3rd Gear Torque Transmission: Transmits engine torque from the input shaft to the countershaft 3rd gear, providing a medium torque ratio for steady-speed heavy-load cruising.

2. Power Transfer: Smoothly meshes with the countershaft 3rd gear to route power through the transmission main box for 3rd gear operation.

3. Wear & Fatigue Resistance: Withstands millions of shifting cycles in heavy hauling, construction, and long-haul scenarios without tooth deformation or pitting.

Input Shaft Gear AZ2210020222 – SINOTRUK HW Series Gearbox Replacement Part

Precision-Engineered Input Shaft Gear for SINOTRUK HW Gearbox – Built to Keep Your Fleet Moving

When a heavy-duty truck sits idle, profits vanish. That is exactly why the Input Shaft Gear AZ2210020222 exists — to restore full power transmission inside SINOTRUK HW Series gearboxes quickly and reliably. Manufactured to OEM dimensional standards, this gear delivers the precise tooth engagement, surface hardness, and fatigue resistance that long-haul operations demand. Whether you are restocking your warehouse or fulfilling an urgent fleet order, Mettlead supplies this critical SINOTRUK HOWO gearbox part at factory-direct prices — with the volume flexibility wholesale distributors need.

Key Features and Business Benefits

Superior Material and Heat Treatment

The Input Shaft Gear AZ2210020222 is forged from high-grade alloy steel, then carburized and quenched to achieve optimal surface hardness (HRC 58–63) while maintaining a tough core. In other words, the gear teeth resist pitting and wear even under extreme torque loads, which translates directly into longer service intervals for end-users — and fewer warranty headaches for you as a distributor.

OEM-Matched Dimensional Accuracy

Every gear undergoes CNC hobbing and grinding to meet SINOTRUK original specifications. The tooth profile, module, and spline fitment mirror the factory component, so installation is seamless. Your customers receive a drop-in replacement that performs identically to the original — no modifications, no guesswork.

Wholesale-Friendly Pricing Structure

Because Mettlead operates its own production lines and partners with tier-one foundries in China, middleman markups are eliminated. As a result, you secure competitive landed costs that protect your profit margins, even in price-sensitive markets across Africa, the Middle East, and Southeast Asia.

Broad Compatibility Across HW Gearbox Variants

The AZ2210020222 input shaft gear fits multiple HW gearbox models used in SINOTRUK HOWO, SITRAK, and related heavy truck platforms. This broad applicability means a single SKU serves a wide range of aftermarket demand, simplifying your inventory management.

Application Scenarios

The Input Shaft Gear AZ2210020222 is specifically designed for the SINOTRUK HW series manual transmission. It sits at the front of the gearbox assembly, transferring engine torque from the clutch disc into the gear train. Below are the primary fitment contexts:

• Applicable Gearbox: SINOTRUK HW Series (HW15710, HW19710, HW19712 and related variants)
• Compatible Truck Models: SINOTRUK HOWO A7, HOWO T7H, SITRAK C7H, and other heavy-duty models equipped with HW transmissions
• Usage Conditions: Long-distance freight, mining haul roads, construction site logistics, and heavy-load urban delivery
• Replacement Trigger: Abnormal gearbox noise, difficult gear engagement, or metal debris found in transmission oil during routine service

For a full catalog of compatible gearbox components, visit our dedicated category page.

Technical Specifications

Parameter	Details
OEM Part Number	AZ2210020222
Part Name	Input Shaft Gear
Applicable Gearbox	SINOTRUK HW Series (HW15710 / HW19710 / HW19712)
Material	20CrMnTi Alloy Steel (Carburized & Quenched)
Surface Hardness	HRC 58–63
Core Hardness	HRC 33–38
Tooth Profile Standard	Involute (GB/T 1356)
Precision Grade	Grade 6 (GB/T 10095)
Surface Finish	Ra ≤ 0.8 μm (ground surfaces)
Brand	Mettlead / White-label Available
Origin	China
Packaging	Neutral box or custom packaging per request
MOQ	Contact for wholesale quantity breaks

OEM / ODM Capability and Wholesale Support

White-Label and Custom Packaging

Need to sell under your own brand? Mettlead offers complete white-label solutions. We print your logo, apply your part-number labels, and pack gears into your branded cartons. Consequently, your customers associate quality directly with your brand — while you leverage our manufacturing efficiency.

Flexible Order Quantities

We understand that distributors serving different regional markets have varying stock requirements. That is why our minimum order quantities are negotiable. Whether you need a trial shipment of 20 pieces or a container load of 2,000, our production line scales to match.

Strict Quality Control at Every Stage

Before any Input Shaft Gear AZ2210020222 leaves our facility, it passes through a multi-point inspection process:

1. Raw material chemical composition verification
2. Forging dimensional check
3. Post-heat-treatment hardness testing (surface and core)
4. CNC gear grinding followed by CMM profile measurement
5. Final visual and packing inspection

This systematic approach means defect rates stay below 0.3%, so you spend less time processing returns and more time growing your business.

Fast and Reliable Global Delivery

Mettlead maintains ready stock on high-demand SINOTRUK HOWO truck parts. Standard lead time for in-stock items is 3–7 working days. Custom or large-batch orders typically ship within 15–25 days. We support sea, air, and express courier — whichever method best fits your timeline and budget.

Customer Case Study: Input Shaft Gear AZ2210020222 Bulk Order for East African Distributor

In early 2024, a Kenyan truck parts distributor approached Mettlead with a recurring problem: their previous supplier’s input shaft gears for SINOTRUK HW gearboxes were failing prematurely, generating costly warranty claims. After receiving samples of our Input Shaft Gear AZ2210020222, their technical team measured tooth geometry and hardness, confirming full compliance with OEM drawings.

They placed an initial order of 150 pieces with Mettlead’s custom packaging. Within six months, warranty return rates on gearbox input shaft gears dropped by over 80%. The distributor has since expanded their order scope to include synchronizer rings, counter shaft gears, and output flanges — all from the SINOTRUK HW gearbox family. Today, they reorder the AZ2210020222 input shaft gear on a quarterly cycle and consider it one of their most reliable aftermarket SKUs.

This case illustrates how consistent quality on a single component — the Input Shaft Gear AZ2210020222 for SINOTRUK HW Series Gearbox — can anchor a broader supplier relationship and improve downstream profitability.

Frequently Asked Questions (FAQ)

What is the exact function of the Input Shaft Gear AZ2210020222 inside the HW gearbox?

The input shaft gear is the first gear in the transmission’s power path. It meshes with the countershaft drive gear to distribute engine torque across all subsequent gear pairs. If this component wears or chips, the entire gearbox loses efficiency and eventually fails to engage properly.

How can I verify that AZ2210020222 is the correct part number for my customer’s truck?

The most reliable method is to check the nameplate on the gearbox housing, which lists the transmission model (e.g., HW19710). Cross-reference that model with the SINOTRUK parts catalog under the input shaft assembly. Alternatively, send us the VIN or gearbox serial number, and our team will confirm fitment within 24 hours.

What causes premature failure of an input shaft gear in SINOTRUK HW gearboxes?

Common causes include contaminated or insufficient transmission oil, misaligned clutch assemblies that create uneven load on the input spline, and the use of substandard replacement gears with inadequate heat treatment. Ensuring proper lubrication and installing quality-certified components like the AZ2210020222 significantly extends service life.

Is the tooth profile of your AZ2210020222 gear identical to the SINOTRUK original?

Yes. We manufacture to the same involute tooth profile, module, pressure angle, and helix specifications defined in the SINOTRUK OEM drawing. Each batch is verified on a CNC gear measuring center to ensure profile deviation stays within Grade 6 tolerance per GB/T 10095.

Can I order a sample of the Input Shaft Gear AZ2210020222 before committing to a bulk purchase?

Absolutely. We encourage new partners to evaluate samples first. You can request one or several pieces for dimensional inspection and bench testing. Once you are satisfied with quality, we will agree on volume pricing and delivery schedules for ongoing orders.

How should the Input Shaft Gear AZ2210020222 be stored to prevent corrosion?

Each gear ships with a rust-preventive oil coating. For long-term warehousing, store in a dry, ventilated environment away from direct moisture. Keep gears in their original packaging until installation. Under normal storage conditions, the anti-corrosion coating protects the part for at least 12 months.

Ready to Secure Your Supply of Input Shaft Gear AZ2210020222?

Stocking the right SINOTRUK HW gearbox parts at the right price gives you a decisive edge in competitive aftermarket channels. Mettlead makes that simple: factory-direct quality, transparent pricing, and a responsive export team that speaks your language.

Take the next step today:

• Request a formal quotation with volume-based discounts
• Ask for free samples of the Input Shaft Gear AZ2210020222
• Discuss white-label packaging tailored to your market

Contact us now to start your inquiry. Our team typically responds within 12 hours with pricing, lead time, and shipping options. Let us help you build a more profitable parts business — one gear at a time.